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首页> 外文期刊>Acta biomaterialia >Micromechanical imaging of dentin with Brillouin microscopy
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Micromechanical imaging of dentin with Brillouin microscopy

机译：Brillouin显微镜用牙本质的微机械成像

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The structure of teeth can be altered by diet, age or diseases such as caries and sclerosis. It is very important to characterize their mechanical properties to predict and understand tooth decay, design restorative dental procedures, and investigate their tribological behavior. However, existing imaging techniques are not well suited to investigating the micromechanics of teeth, in particular at tissue interfaces. Here, we describe a microscope based on Brillouin light scattering (BLS) developed to probe the spectrum of the light scattered from tooth tissues, from which the mechanical properties (sound velocity, viscosity) can be inferred with a priori knowledge of the refractive index. BLS is an inelastic process that uses the scattering of light by acoustic waves in the GHz range. Our microscope thus reveals the mechanical properties at the micrometer scale without contact with the sample. BLS signals show significant differences between sound tissues and pathological lesions, and can be used to precisely delineate carious dentin. We also show maps of the sagittal and transversal planes of sound tubular dentin that reveal its anisotropic microstructure at 1 pm resolution. Our observations indicate that the collagen-based matrix of dentine is the main load-bearing structure, which can be considered as a fiber-reinforced composite. In the vicinity of polymeric tooth-filling materials, we observed the infiltration of the adhesive complex into the opened tubules of sound dentine. The ability to probe the quality of this interfacial layer could lead to innovative designs of biomaterials used for dental restorations in contemporary adhesive dentistry, with possible direct repercussions on decision-making during clinical work.
机译：牙齿结构可以通过饮食，年龄或疾病如龋齿和硬化症改变。表征其机械性能以预测和理解蛀牙，设计恢复性牙科手术以及调查其摩擦学行为非常重要。然而，现有的成像技术不适合于研究牙齿的微机械，特别是在组织界面。这里，我们描述了一种基于布里渊光散射（BLS）的显微镜，该显微镜用于探测从牙齿组织散射的光的光谱，从该光谱可以通过优先考虑折射率的先验知识来推断出机械性能（声速，粘度）。 BLS是一种非弹性过程，它使用GHz范围内的声波散射光。因此，我们的显微镜在千分尺刻度下显示出机械性能而不与样品接触。 BLS信号显示出声音组织和病理病变之间的显着差异，并且可以用来精确描绘龋齿牙本质。我们还展示了声音管状牙本质的矢状和横向平面图，揭示了下午1点分辨率的各向异性微观结构。我们的观察结果表明牙本质的基于胶原基质是主要承载结构，其可被认为是纤维增强的复合材料。在聚合物填充材料附近，我们观察到粘合剂复合物的渗透到声牙齿的开放小管中。探测这种界面层的质量的能力可能导致用于现代粘合剂牙科的牙科修复物的生物材料的创新设计，可能在临床工作中的决策中直接影响。

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